CAIE A Level Biology 9700 · Cell structure

Cell structure: define question

Define4 marksStandard

A student views a stained liver cell under a light microscope and uses an eyepiece graticule to measure its length. The eyepiece graticule is calibrated using a stage micrometer. The cell's image on a photomicrograph has a length of 18 mm. The actual length of the cell is 12 μm.

Define the terms 'magnification' and 'resolution' as applied to microscopy, state the relationship used to find magnification, and explain why resolution, not magnification, sets the limit on the detail that can be seen.

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